# SETXOFFSET

## Purpose:

Specifies the x-offset of a series.

## Syntax:

SETXOFFSET(series,
xoffset)

series |
- |
Optional. A series or table, defaults to the
current Window. |

xoffset |
- |
A real, the desired starting X value of the
series. |

## Example:

setxoffset(W1, -10.0)

sets the offset of the series in W1 to
-10.0.

## Example:

To set the offset of W1 to the offset
of W2:

setxoffset(W1, xoffset(W2))

## Remarks:

Many series have X values that are monotonically
rising by a constant X increment such that:

A series with X values of this form is
referred to as an interval series.
Because any X value from an interval series can be computed with:

an interval series requires only the DELTAX and XOFFSET
values to determine the X values. Thus, for an interval series, explicit
X values are not necessary, decreasing the data storage requirements by
a factor of 2. Also, because the X values for an interval series are regularly
monotonic, speed optimizations for plotting and computations are available.

See XY to create
a series with irregularly spaced X values.

Functions such as AUTOCOR,
CROSSCOR and AMPDIST
display the correct X axis values.

EXTRACT
also sets the offset. For example, to extract 128 points at index 100
and set a zero x offset, use:

extract(W1, 100, 128, 0.0);

The Import Utilities recognize the optional
header keyword X_OFFSET, so you can specify the offset when importing
data files.

## See Also:

DELAY

SETDELTAX

SETDELTAY

SETX

SETYOFFSET

XOFFSET

XY

YOFFSET